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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3211903acf879c31b7c7fb43b64dc77c5510c6bfd6d5858c5ed0d1b4e6ce3a' 
  AND token = 'bDtgFywPs/MNRR3pUprk1+husCUxE8UStJQeLK0MMRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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