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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2a705677d72f67d096507984352888cf6ba4ed4de473f4fde807532cdc2acc' 
  AND token = 'pK5SD+3VjXB1avOuxGoy8thUrl3IFEI5goGAfhM5e6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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