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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd11803462fa5e2d8ff873773973d6f165254fd3a83f9fb4c852f841ed108378' 
  AND token = 'bLakIhxJBAkllcSIQ7oSjNCdAiJZFpSRNpoT8jzgq1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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