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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f878403aba5336a45e2093d62296439070513490d9990df916dc578c4a364d' 
  AND token = 'i4DRisV0x3dONezNqSF+Yavxyd5IYINUAW+7nKGiM60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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