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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba0e52ae989e0b9b017fa14980fc4702b42ba72f4023ce45bc480694e591f74' 
  AND token = '80UAngDg7q9ZC45R3yAp7pvfnXWzYQjtEA+3TCqEh+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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