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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff40e24f2d30fdae4e6be45a7d5a9347804d427806f41daa02c8f17b315eada' 
  AND token = 'HIQ3+vYCadZdgNPuZ662Px+Dr4fql+XQR9VN/KDIhSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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