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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d7f99babc607962341efba6cd33d798c05868fe6ff6872caebe02c5f8d2ade' 
  AND token = 'beOgsH+m3aiyRFudlPGxRm1/hbERmdk9O44MoBkWqLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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