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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0a401130a0e060488e5b5c793d192616a7394a6a2ba2ee76bd673e76cbb5ec' 
  AND token = 'VeVpG1+Lv2oJvizzS4bNxQJUqMOoo7iKvfgjqKLNWps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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