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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0959bed4d5a0d7297ed6764a8c973341aed2d7ae048ac8453bb3c70683426b01' 
  AND token = 'dQKyenvExRh0Fn7UPSTN1WYHJ5YOsu60YrDviqmwZoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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