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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2ae3da7bcccc0f50b8918d0f302e12cb9e9ad6a7e7aa1fe62155506d862205' 
  AND token = '3JkWaCtDxcTH2Ay30TSHckSVhUmVxIy+n2ba+4ITTZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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