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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6097a63815a6c6a6d5ddd8de5f8f77a50e48b44cc003b8164abd768b64ecebac' 
  AND token = 'AEeeGNX3aKuVUBny2M+lP2S7G5Co4/7ta3JVzqizzBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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