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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cc5a40c8daee6b0672a8ab4194579ef05dd9f3addcbe9c26292b9b4f241dc2' 
  AND token = 'o8NLgeOePi3MUrAjmSaNUrwhCskOT+Owvs+CQ0IKWjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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