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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f41851a87ccbd5a32a21ee4bf5e5d392cc7b7b92d8a2276172704dc1fb0bcf' 
  AND token = '9Iehamyy6XVQ6+hwMPdHWo+4qNSqSOjQtTeoTLarSr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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