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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a7d8c97d3253c2abab59216f3ab83d3dd5a78d8741dde4de9a17cfc62fb902' 
  AND token = 'jO91CmSqkS+MCG3N15VdXQXpl/B2zRPshC5feD4HJ5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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