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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1940062be5c5939cb7a02d0354510c17ef0a6cacf91b75f9d963d04bd4d67bc0' 
  AND token = 'gQvhkyUXEz9zSHLwZSEYHscO5M3TqGxGN5tk8DUPfoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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