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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a41bd36704f1266d4b3f7038b89a05523e9fdf7eafeb2bb95ef0af3fe94d0f8' 
  AND token = 'qjxApfUUrWVsNy0GfZTmifpL/TX6+6iLYCYreXnX3E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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