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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14a64ac34003d8b8dcc4b023b8a07efad638069632ea00a8c9e7dfcba9b3a7e' 
  AND token = '9IiBwJ2MO9toL1feA8t2wQby5UdxTZ0oS558mGwnL9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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