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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f936edf146fe4724a78f8156d6b576d4ae47f2711fbd02ca33c1ca0646b0255' 
  AND token = '3PDm4E8kRByt8eB4CmMd+Joo8wcXhMKkkpXjNCvUHhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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