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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6294476fdd87332fa23c6dd428f91c579e82bae012e98cd3a8f6b1043a40b4fb' 
  AND token = 'Y6gdb5MZwwRZf75lpdsoegnrukPVrYrTpAyaUFtaQVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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