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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f196f444e81aa4dee5e6a2cbd79a239706a02c108591b032527e25a4fc9e98ee' 
  AND token = 'wP6YnUCxP32vbjGOlFFzA95AjjDnG4dZtM7dwIRyH0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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