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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09d09956447f2c9e0e69f513305fa1ac413f2b3ea25a280a2acdbbd027538d7' 
  AND token = '6l0zz+QL+3+9ZDXGjwZXQgXQO3iiTyQIlzADPiYJ+xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}