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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bd4d9215d7d2e0b28da79f90be31258684698b96db02cdc998aa1e251aac5c' 
  AND token = '1F3WBPiJZ0nWU+qRXzQzEMJXeWwZ7EBCWrp5aBW3IKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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