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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f23662d3e8709ef5ce38aef74a6aba77547d6894f9b24df3c997fa7afcc4be' 
  AND token = 'DXlDqdi8ci17N155UFvg+vRYjcRqG8hlC7rXIyeictk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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