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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8d0391ad1ce0b2e1544a12173e9736041c03c022be628528fd09f7d4b0f083' 
  AND token = 'TMXxt6zibUBFATJrT1wuZDw112M8/7Ru4gnstwGZFWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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