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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628725ff364768393584ac495bf38b449e78f6b24f4237bbf8c22f7e54d7e317' 
  AND token = 'DKx3FSuoQpygTFFRN9kQ0Nn+IyW9HDt4rkAEcud0/vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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