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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3449a1306bb7be8571e39724778a66435b7c2a04a271976a2f7f11145e64720a' 
  AND token = 'Fo9oUmnrRjrzf4Sme9sJD8c2BTiTrfKIpnE/AtHPCLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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