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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b1e27dfe0ad9ed435ddafb4f22d01114de45f43a77ed5cd0e8f905054bdfe2' 
  AND token = 'CeubPG96nl9OEmM1fAB2IYNf9zwat3UHvoTLbV38zI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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