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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390bed4e7610d98424ac63a5d40e891eb1414acbe47e4993d9ea9dba636f2ff1' 
  AND token = 'CeyKSbL5TWaRm0KY2l0ceKXWmms/2HB5ZUykgW7IULc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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