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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac66bb3c61b3cbe76de1ed10e6f7366dbafdaf792273546715b11fe1b4b6f6e7' 
  AND token = 'oPUqmWEdbgX7XOH69THiOewAyW4Op1IqILmwqJA4LRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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