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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5690eff025aeefefdcb01840b2d0b8eaa53973e5b3d38b0f55421a22add20372' 
  AND token = 'oE0cMSRSY6IebINJmaNNPR5fel762yUEhLLk/Nw3Occ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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