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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdc380dabd1b72314d5d3a0f10261ce7126c061e9a2cb6bb402e19c86a9073b' 
  AND token = 'p0c4d3XWz4jzuBIM11iRGaaEt9CUZWrCDZ4vXxqk2KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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