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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc2f4c7f9fa993686bac76ed768ee7332aface17f8536c45c72869ca902b986' 
  AND token = 'uC5/xik0zixo5EKv1GYCm/xnB9piBz62dsGrotvx2aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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