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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e267cc60bf81c4599935879d3dd4e7954ff74ad0f4e36e7ea656344bd40877' 
  AND token = 'SEgUAhrgS8frmoQvZVXlf03jo6wyh3Mctp1i7TNRUm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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