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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23b8c80e2e58e953f91343006793f2c77795cdf2fcdb37e2f6230b6d269502d' 
  AND token = 'y0euozs62gMs5rEv8A63yjGU2/bHGTh8jEoOPyEBLkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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