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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa788aa00c091dcfbf2b9fa21688d135bcfff424ba3659f3dc7e62e77f9f048' 
  AND token = 'vdRajRycopNiYOcz+2eewGbQBnjQ4H6neGMUv7SQu4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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