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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a7c8db08c34e5b8009e3376eab9b5572192c7cbaac6ac292eaecbf67aac51f' 
  AND token = 'gdgm/6Rl3FiGhK7FFwUDfKhmPHjpA0KWYpdJfkAt0gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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