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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b10934c106c040a2ec36ba074d5e3304b50949d1aa29c67d0c7a0a83f2a7103' 
  AND token = 'OIYhL924ycqs+nPUrWVq2LAC2llVPLm41KdBLFc9HLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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