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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af42b9723e8235b85ad6dcd5cfd9b652603773a004c852ca57b81dc1f99ca57c' 
  AND token = '7OsAeUWXagf33TE5w2Qj0j7OVtonzLCS3NzP+gZBKlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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