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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a940bbbebefde9c9809af679e9b7c8734d1ca274a96f0bd8b03b9cd4e6b081d4' 
  AND token = 'RNR+6gBVCWmm73jnr/LMw4vLTNPhNRM+5jjHv26vKas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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