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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4c679118c9ea8f2d4de7f1d91a4bc3bf44f4683adf04d7f98c92b132faba2a' 
  AND token = 'Tc9CjNcbJb+yJJO022GEULLX4wadI08TJehtDs3UoLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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