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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbb8a1bae43ba9d6226513e91abb34a82cc74c0be6e6183c114a0f85e0feb55' 
  AND token = 'ZRiLnRbFh68KZ3/TazeARzoChd7YSsobh1iOqtRp80s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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