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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae34ec4fb64a856f6dde68ad23e6d7878330b168f8247f00518bbf85a763881' 
  AND token = 'Rr385fIWM+fSgX3Vpc0QttkEUCsma3R7V0OzbBIUCBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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