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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e74f62926ab2a663f5ed6a47e75405bef888b2ffc8c43aa2ddc3bc513d2f6c75' 
  AND token = 'eGxNXodMbZft8P56lYm1mufky6XLYaFbeV74ZNtw4eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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