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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6240983708235bb37b74cbc54d27a9bf95cd00f61fcdefec16b2e25feb60edc7' 
  AND token = 'G2H+B+UE8tggVJwG1292oVP9+l1rPbXQGQikOIUBpvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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