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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e5bae8f32fa9a7507ec5c872e1e2d409291c8034249c6896bf4cf524d138aa' 
  AND token = 'Ex6NcE+VE8iNA6eKsJCSKbd7U82bkCXirx9DqsGDQMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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