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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adab88914a0bd79904656ed8b5017ad0c31ee46ce734323bdb7be76df98b3256' 
  AND token = 'L7CtgwzTj3VhtaF0wHm3nl4CK3IrbYjCiSP9wNg5qyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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