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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217038f912a84e9627e2ab0758129cd7e0ac29ec5e83dd3d3aac5cc57d4857ef' 
  AND token = 'TPy/qhtH8l3C1q9QUbrw8cQ45+8FQChimRlwudobe+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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