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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602b12eddb70d2f39fff577fec369c45e47caf6f72c3a2385c4f414f02ec64cb' 
  AND token = 'KS9WfPcsfhEbi1PmQ0YJt5YwniQzsq2Xkn7e4BFhXo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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