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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ff32d452b2cd9c938c49838de96c4c4c0e5cdd23840c5bf8ddc0b883398d83' 
  AND token = 'Ro9zwhKJM3mrnf+e40Fg2+5DWfQrLuEj83iq7dVwDTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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