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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8eafb3a850b7b7210a45c114a0db8f8b945c450f657320d4e89909484b5fb31' 
  AND token = 'QzUs4+MzlU16yL1qPQuiSRs0L5WjYQDaq9v1qkOdfhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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