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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd348de36ce2a9a26a79a8c9406e86ffe7c5c4917e6d1e5651ab78d4ed2de23f3' 
  AND token = 'yw40GwKyMtW5sZAy/WZ6ppCQnFUIYpL4vfRHIeJJb6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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