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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64d3428820155c8e641d83009b07d1aa337b7c56d405c55fa22dec815040b20' 
  AND token = 'jPA+G2ofcrCBnwrth3Pviu5LMaH/ojfDXy+ltm8salo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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