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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f5f8057bb9b0049c960d0aca7e1bcb2adf4098805df803aa370629937c4761' 
  AND token = 'K4IOk8BM9B35Wz1trQSKn5JLVJvhO3anzU9LSI1ALdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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