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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe15891e819bab6dd6f2b78b9d285d5d2385c2cf9a679ec6bc575fc0f3d2a30f' 
  AND token = 'H1LG8jpARL/E4efLpbNkRy4LkRTSwt+G/omsM2LAUlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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