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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abc83e6e726c60c354ca665d86dac6d6bc5cfeb88da4efd9e12e699e5e36a04' 
  AND token = 'It8WabVpjRBe/i6wKrYdWUKUWZvJBmxhc5Xn+SuvW0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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