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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7fdde9ccfcfba8b752165c4f433d3453b0c92de1b40dd7601624c108d6f430' 
  AND token = 'ePMa95i2bgbMJTwNctJqw46lwEROLX1K9lj0n0/uryo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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