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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ffafa59327c86c37224fd0e72e09b85799dc6808a2b5608bc422c8e5477ad65' 
  AND token = 'wdZgQdppNEGnRhZF6RvfCcBo8kPCATwkf3IkDLVbwnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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