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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe565b67e9c8bb575177d56aba38fb507393c8fcf8780cd503362d2205613f4' 
  AND token = '/QQ+18vSttpl54I0mCvVMwlcLtZYQ2ZTHNhZ1sNI2Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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